GOFFSTOWN — Police said Monday they have located and spoken with a man they say walked into Goffstown police headquarters Sunday afternoon, left behind a bottle of liquid and a note suggesting the contents could be hazardous, then left — forcing the station to be put into lockdown and a state police bomb unit to be called.

According to police, who did not identify the man, there is no risk to the public. The man might face criminal charges, police said.

Lt. Thomas J. Hammond said at 1:16 p.m. a bottle filled with an unknown brown liquid was found inside the lobby of the Goffstown police station on Mast Road.

According to Hammond, after police reviewed closed-circuit television footage from security cameras both outside and inside the police station, they saw a man approaching and entering the building, carrying what appeared to be a 12-ounce soda bottle.

Once inside the lobby, Hammond said, the man placed the bottle on a table with a note containing language suggesting the bottle contained a hazardous material. The man is then seen walking out of the building without making any contact with police personnel, Hammond said.

The police station was temporarily placed in lockdown until members of the New Hampshire State Police Explosives Disposal Unit responded and rendered the bottle and its contents safe, and the police department lobby was reopened.

Officers continued to answer calls for service from the public while the station was in lockdown, Hammond said. Further testing will be completed this week to determine the exact contents of the bottle.

Hammond said the man who left the bottle was driving a dark grey Honda Accord with NH license plates, and appeared to be wearing a dark sweatshirt, grey sweatpants with a large “Calvin Klein” logo on the left leg, as well as red and black sneakers.